Mold for blanks for making conical metal tubes.



Patented Oct. 3, I899 E. BUCK. MOLD FOR BLANKS FOR MAKING CDNICAL METAL TUBES. Application filed May 15 1899 No. 634,l60.

(No Model.)

w//////////////////n// wdf EMIL 1360K, OF OBERHAUSEN, GERMANY.

MOLD FOR BLANKS FOR MAKING CONICAL METAL TUBES.

SPECIFICATION forming part of Letters Patent No. 634,160, dated October 3, 1899.

Application filed May 15,1899- Serial No. 716,796. (No model.)

To aZZ w/wm it may concern.-

Be it known that I, EMIL 1360K, a citizen of the German Empire, residing at Oberhausen, in the Province of Rhenish Prussia, Kingdom of Prussia, Germany, have invented certain new and useful Improvements in Molds for Blanks for Making Conical Metal Tubes; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to use the same.

For making conical wrought-iron or steel tubes and masts hollow blanks or blocks are required which have parallel sides outside and a conical hole in the middle. those blanks have been cast with uniform thickness throughout, paying no regard to the hole therein, and the casting of such thick blocks causes considerable difficulty, because the core in the mold forming the hole in the blank, tapering strongly when made of metal, very easily melts away at-the thin end, and when made of sand has the tendency to stick to the metal cast around it. This is caused by the great mass of hot metal and the heat accumulated at the respective part in the mold; and it is the object of my invention to avoid this by giving the mold in which the blank is cast such a shape that the quantity of metal is distributed proportionately to the volume of the core, but keeping at the same time the inner sides of the mold parallel and the inner diameter uniform in one direction. In the other direction the diameter may by preference be reduced gradually toward the thin end of the core.

On the accompanying drawings I show the new blank and the mold used for casting the same.

Figure 1 is a vertical section of the mold along line III of Fig. 4. Fig. 2 is a view of the mold seen from the top. Fig. 3 is a cross-section along line IV IV of Fig. 1. Fig. 4 is a view of the mold seen from the bottom.

f represents the casing of the mold, the inner sides a b of which are parallel, while the sides 0 d converge toward the top. 6 represents the core of the mold, which tapers from bottom to top.

Heretofore" It will be seen that the core of the mold is elliptical or oblon g in cross-section at the bottom, but circular at the top, and that the inner face of the exterior wall of the mold is vertical only opposite the ends of this ellipse, but at the top extends laterally into two wings and tapers upward from the elliptical bottom at all points of the latter to the top thus formed, leaving a space of equal thickness at all points between the core and wall except where the wings at the top are adapted to form solid wings in the top of the blank compensatingfor the reduction of material as the blank tapers upward from its elliptical bottom to the circular central top part surrounding the upper end of-the bore. It will thus be understood that the Volume of metal at each place is approximately equally distributed in proportion to the size or the volume of the core placed in the mold when the blank is being cast, and it is by this means that the result aimed at is attained.

Having now described my invention, I declare that I do not claim, broadly, the use of hollow blocks for making conical. tubes; but

What I do claim, and desire to secure by United States Letters Patent, is

A mold having a central core, the latter be ing oblong in cross-section at the bottom and circular at the top and the inner face of the wall approximately corresponding at the bottom to the shape of the said core so as to leave an oblong annular space between them, but having at the top a central, rounded outline with two lateral wings, the said wall being vertical from top to bottom at the points corresponding to the greatest diameter of the said core and the surrounding space and tapering upward at all other points from the top to the bottom, substantially as and for the purpose set forth.

In testimony whereof I have affixed my signature in presence of two witnesses.

EMIL Boon.

Witnesses:

R. E. JAHN, OTTO KoNIe. 

